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Crystallogenesis and Mineralogy
Saint Petersburg, Russia
30 September-4 October 2007
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Conferences & Meetings 2nd International Conference "Crystallogenesis and Mineralogy"
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Supramolecular microstructures of concentric-zoned agates

RMS-DPI code:  2007-1-154-0
Scientific session:  Session 5. Crystal chemistry and crystal morphology of minerals
Author listing:  Slastnikov V.V., Punin Yu.O., Nesterov A.R.
Principal author:  Slastnikov Victor Valentinovich
Language:  Russian
Abstract - Summary 
(short description):
Agates are natural hierarchical dissipative structures, composed of silica minerals: chalcedony, quartzine and quartz in general. In chalcedony we can find helicoidal fiber twisting and periodic fiber striations in micrometer scale. X-ray power diffraction proved that both this defects do not affect the structure of quartz dramatically. Variation of interzone distances in these rhythmic fiber striations is highly informative about microdynamics of silica crystallization. Periodic fiber striations are the result of segregation of little portions of silicagel while chalcedony growth. Fiber twisting is a product of heterometric tension which occur in case of asymmetric Si4+Al3+ substitution. In our hypothesis variation of twisting period is indicative for the composition (pH) of the initial medium.
 
RMS-DPI code:  2007-1-154-0
Proceeedings volume 
in the RMS catalogue:
 
Crystallogenesis and Mineralogy
Pages:  349-351
File of proceedings 
(PDF): 
 260 K
Status:  printed
Accepted:  10/05/2007
Published on-line:  05/01/2008
Permanent address of publication:  http://www.minsoc.ru/2007-1-154-0/
Contact author(s):  Slastnikov, Viktor Valentinovich
 

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